1. To control the echo in Audi auditorium following materials may be used
(A) Porous plaster
(B) Heavy curtain
(C) Carpet
(D) All of these
2. The unit of intensity of loudness is
(A) Newton
(B) Meter
(C) Decibel
(D) Cm
3. Minimum distance between source of sound and obstruction for producing echo
(A) 5 m
(B) 17 m
(C) 10 m
(D) 32 m
4. Velocity of sound in air in meter/second
(A) 75
(B) 165
(C) 345
(D) 535
5. Sound travels in air in the form of
(A) Wave
(B) Longitudinal waves
(C) Longitudinal axis
(D) None of these
6. The amount of sound energy transmitted by fluctuations in air is known as
(A) Pitch
(B) Echo
(C) Intensity of sound
(D) All of these
7. The frequency of vibrations is known as
(A) Intensity of sound
(B) Pitch
(C) Echo
(D) All of these
8. Sound heard by reflection from a wall is called
(A) Pitch
(B) Intensity of sound
(C) All of these
(D) Echo
9. The time for which the sound persists in a hall after the original is known as
(A) Pitch
(B) Intensity of sound
(C) Reverberation time
(D) Echo
10. The regions where no sound is heard in a hall are known as
(A) Air borne zone
(B) All of these
(C) Echo
(D) Silence zone
11. The sound transmitted in air and progressed through air is known as
(A) Structure borne sound
(B) Intensity of sound
(C) Air borne sound
(D) All of these
12. The broadcasting room should be
(A) Moisture proof
(B) Water proof
(C) Sound proof
(D) All of these
13. DB is abbreviation of
(A) Decibel
(B) Deciball
(C) Desidel
(D) All of these
14. The points of low intensity of sound created by unsatisfactory hearing are called
(A) Silence zone
(B) Dead spots
(C) Foci
(D) Fringes